We go to washington where president obama is spending incoming fire on several fronts. First the latest on the irs targeting the president's political opponents for special scrutiny. Jon karl is on top of this. We're learning overnight this targeting effort was more extensive than first revealed. Reporter: That's right, george. The irs has said this was limited to officers in its cincinnati office but these two letters provided to me by a lawyer for some of the groups show that at least some of the targeting was done right out of washington, d.C. The letters which have a return address of washington, d.C. Specifically ask for information about donors. Something applicants for tax-exempt status are not required to provide. As the scandal grows, the irs is now acknowledging that acting commissioner steven miller has known about the targeting of conservative groups for a full year. First learning about it last may. But the irs did not publicly acknowledge or apologize for it until just a few days ago. The saga has rocked the white house. In a news conference monday, the president said he was only made aware of the situation on friday. I can tell you that if you've got the irs operating in anything less than a neutral and nonpartisan way, then that is outrageous. It is contrary to our traditions, and people have to be held accountable. Reporter: That's not good enough for some conservatives who point to past references the president has made to tea party groups. I've been a little amused over the last couple of days where people have been having these rallies about taxes, taxes. You would think they would be saying, thank you. The obama regime is using government to investigate people. Reporter: And now some of those who they were unfairly targeted are speaking out about their experience and those inappropriate requests. The irs wanted to see my personal facebook page. They wanted to see my personal twitter account, pictures of my children on it. Reporter: There are almost certainly more shoes to drop. I expect that the inspector general report looking into all of this will be out later this week and, george, on friday, we will have a first and I'm sure the first of many congressional hearings on this subject. No question about it. Jon, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.